4 days ago · The meaning of INVALID is not valid. How to use invalid in a sentence.

A person who is very sick or injured and needs frequent care is an invalid. Also, something no longer current or useful is invalid. The main uses of this word have to do with people and things that don't …

INVALID definition: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.

If an action, procedure, or document is invalid, it cannot be accepted, because it breaks the law or some official rule. The trial was stopped and the results declared invalid. We cannot accept liability if you …

May 17, 2026 · Adjective invalid (comparative more invalid, superlative most invalid) Not valid; not true, correct, acceptable, or appropriate. Synonyms: disallowed, nonvalid Antonym: valid Your argument is …

He was returned, but the election was declared invalid. A fall from his horse in 1845 made him a hopeless invalid, and completely removed him from public life. She is almost an invalid. He became …

Define invalid. invalid synonyms, invalid pronunciation, invalid translation, English dictionary definition of invalid. n. One who is incapacitated by a chronic illness or disability. adj. 1. Incapacitated by illness …

Not valid; of no force, weight, or cogency; weak. In law, having no validity or binding force; wanting efficacy; null; void: as, an invalid contract or agreement. To affect with disease; render an invalid: …

a person who is too sick or weak to care for himself or herself: My father was an invalid the last ten years of his life. [Archaic.]a member of the armed forces disabled for active service.

Invalid generally refers to something that is not true, correct, acceptable or legally recognized. It denotes a lack of soundness, cogency, or legality, rendering something ineffective or useless.